One-Horned Lightning

Yuugi Hoshiguma's Focus Shot (a Touhou LW original). She focuses her qi into the horn on her forehead to call down lightning on her opponents. In the eight trigrams, lightning corresponds to the northeast cardinal direction, which is also known as the kimon, or oni gate, as it is said to be the direction from which oni come to and from. This is why the Shinto god of lightning, Raijin, is depicted similarly in appearance to an oni―A mix between a bull and a tiger.